William leist



, 2 2 M m. 2 m m 4 a m M/ 1 mmmm 4 n a J v (Application filed Feb. 11, 1899.)

ill

No. 624,8I5.

G. H. JANTZ, W. LEIST & 0. W. JANTZ. GOMMUTATOB BRUSH HOLDER (No Model.)

. 1 1 UNITED STATES PATENT, OFFICE.

GUSTAVE HENRY JANTZ, on WYOMING, WILLIAM LEIST, or NORWOOD, AND oTTo WILLIAM JANTZ, OF CINCINNATI, OHIO.

COMMUTATOR-BRUSH HOLDER.

SPECIFICATION forming part of Letters Patent No. 624,815,6latecl May 9, 1899.

Application filed February 11, 1899. Serial no. 705,263. (No model.)

To ctZZ whom jimmy concern:

Be it known that we, GUsTAvE HENR J ANTZ, of Wyoming, WILLIAM LEIST, of N or wood, and OTTo WILLIAM JANTZ, of Cincin- 5 nati, in'the county of Hamilton and State of Ohio, citizens of the United States, have invented certain new and useful Improvements inCommutator-Brush Holders; and we do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the figures of reference marked there- I 5 on, which form apart of this specification.

, This invention relates to certain improvements in holders for the commutator-brushes of electrical machines, and has for its object to provide a holder which shall be simple and inexpensive in construction and which shall be adapted to hold the brush or brushes in proper contact with the commutator-surface, being so constructed as to automatically adjust said brush or brushes so as to take up wear of the parts and also to accommodate any irregularities of surface or movement which may exist in the commutator.

The invention consists in certain novel features of the construction, combination, and arrangement of the several parts of the improved brush-holder whereby certain important advantages are attained and the-device is made simpler, cheaper, and otherwise bet teradapted and more convenient for use, all

as will be hereinafter fully set forth.

The novel features of the invention will be carefully defined in the claims.

' In the accompanying drawings, which serve to illustrate our invention, Figure l is a face view showing a holder constructed according to our invention and designed'for carrying a single brush, the supporting devices being shownin section at one side of the brushholder. Fig. 2 is a vertical section taken centrally through the brush-holder in the plane of the brush-axis. Fig. 3 is a fragmentary sectional view taken transversely through the lower part of the holder and brush carried thereby. Fig. 4 is a fragmentary view show- 50 ing the lower end of the brush-moving arm detached.

,In the views, 1 indicates as a whole the frame of the brush-holder, constructed with parallel vertical side pieces 2 2, connected or tied together at the central part of the brush- 5 5 holder frame 1 by means of a transverse tiebar or brace 3, integral with the frame. The frame 1 is also formed with integral lugs 4 at opposite sides, said lugs having threaded V sockets 5 to receive bolts (not shown) for attaching the holder to thearnl ordinarily provided for supporting the holder in position.

As shown in Fig. 1, a subbase, 7 is interposed between the holder-arm (not shown) and the lug 4 of the holder, saidv part 7 having a recessed boss 6 to receive one of the lugs 4. By constr'uctingthe holder with lugs 4 at opposite sides it is evident the device is fitted for use on either side of the commutator, and be ing thus made interchangeable renders the device moreeasy'of assemblage than would be the case otherwise.

The. lower part of each side piece 2 of the frame lis formed with a guideway 8, the respective guideways 8 being arranged to project inwardly of the frame toward each other and having their under sides dressed parallel and fiat to receive the brush 9, which may be of any desired material adapted for slidingmovement along said guideways 8 of the holder and provided witha beveled front end 10, adapted for superficial contact with the commutator, (indicated by dotted lines at 11,) as shown in Fig. 2 of the drawings.

In order to-hold the brush 9 securely on the 85. guideways 8 at the base of the holder-frame while permitting free movement of the brush lengthwise of the guideways to accommodate surface irregularities or wear of the parts, we provide a plate 12, preferably formed of some 9 good conducting material, having its edge portions .18 bent up sufficiently to permit them to take over the upper surfaces of the inwardly-projecting guideways 8,while the central or body portion of the plate 12 is held in close contact with the upper surface of the brush 9 by means of a screw-bolt 14, extending through the brush 9 and having a Washer 15 beneath the same. The head of the screwbolt 14 is arranged beneath the brush-9, and 10 the threaded end of said bolt carries a nut 16, beneath which is clamped the said plate I and also above said plate one end of a flexible conducting-strip 17, which is carried up, as clearly shown in Figs. 1 and 2, and secured to the upper surface of the brace or tie bar 3 of the holder-frame by means of a screw 18. By this construction a proper electrical connection is established between the brush 9 and the holder-frame 1, so that such connection does not depend entirely on surface contact between the brush and holder, and con-' sequent sparking, heating, and loss of force are prevented.

The upper extremities of the side pieces 2 of the holder-frame 1, above the brace 3, are connected by a pin or shaft 19, extending between them, on which pin or shaft is held a yoke 20, having ears or forks mounted to swing on the pin or shaft and having a depending curved arm 21 extending down from its central part and provided at its extremity with an enlarged and flattened portion 22, which forms a bearing-surface'adapted for engagement with the rear end-of the brush 9, as clearly shown in Fig. 2. The rear end of the brush 9 is made rectangular, and the flattened bearing-surface of the part 22 of the brush-moving arm 21 is arranged at an angle to said rear end of the brush and is adapted to bear against the lower angle or corner thereof, so as to reduce as far as possible the friction between the brush and arm and also to hold the rear end of the brush in proper relation and engagement with the guides S, whereon the brush plays, as will be readily understood. The space between the guideways 8 afiords a recess or way wherein the end 22 of the brush-moving arm is adapted to play, so that it is made possible to use a brush 9 of less length than would otherwise be required.

A helical spring 23 is coiled on the central portion of the pin or shaft 19 between the ears or forks of the yoke 20, and has one end 24 bent down into position to engage behind said yoke, while the opposite end of said spring is bent, as shown at 25, to form a projecting part or handle adapted to be engaged with a slot or notch-26, formed in the edge of an overhanging segmental flange 27, formed on the extremity of the adjacent side piece 2 of the holder-frame, as shown in Fig. 1. A series of the slots or notches 26 will be provided, by preference, in the flange 27 in a well-known way, so that the tension of the spring 23 may be adjusted to cause the brushmoving arm to press the beveled end of the brush 9 against the commutator-surface 11 with the required force. The parts are so arranged that when the brush 9 is moved back alongits guideways 8 out of contact with the commutator-surface 11, as indicated in dotted lines in Fig. 2, the extremity of the brush-moving arm 21 may be engaged with the upper surface of the brush, as indicated at a: in said figure, so as to hold the brush in its retracted position. In this way the brush may be conveniently held out of contact with the commutator-surface when free access is desired to the latter for purposes of oleanin g or repair.

In use when the holder is secured to itssupporting-arm in proper relation to the commutator-surface the force exerted by the spring 23 upon the brush-moving arm 21 will serve to actuate said arm to press the brush elastically against the commutator-surface 11 in such a way as to compensate for any irregularities of surface or of movement of the commutator, and the flexible strip 17 affords a positive electrical connection between the brush and its holder at all times, so that dependence upon mere surface contact between these parts is altogether avoided. The plate 12, with bent edge portions 13 engaging the guideways 8 of the frame, also affords a convenient and inexpensive means for hold-.

ing the brush to its guideways, while permitting free movement of the brush along the same, and it will also be obvious that this arrangement insures a proper contact between the brush and holder, since thelifting of the brush oif its guideways at any point merely serves to force the edge portions 13 of the plate 12 more closely against the guideways at that point. The construction of the brush-moving arm 21 with a yoke at its upper end alsoim proves and strengthens the mounting of said arm and insures free movement thereof.

From the above description of our inven tion it will be seen that the improved brushholder is of an extremely simple and inexpensive nature and is especially well adapted for use, and it will also be obvious from the above description that the invention is capable of some modification without material departure from its principles and spirit-for example, to adapt it for use in connection with a plurality of brushes-and for this reason we do notwish to be understood as limiting ourselves to the precise form and arrangement of the several parts herein set forth.

Having thus described our invention, we claim 1. In a brush-holder, the combination of a frame having projecting guideways, a brush mounted on the guideways, means carried by the brush and engaged with said guideways to hold the brush for sliding movement on the frame, and means to hold the brush in yielding engagement with the commutator, substantially as set forth.

, 2. In a brush-holder, the combination of a frame having side pieces spaced apart and provided, respectively with parallel guideways projecting toward each other and spaced apart to form an opening between them, a

brush mounted on the guideways, means carthe guideways in engagement with the brush to hold said brush in yielding engagement with the commutator, substantially as set forth.

3. In a brush-holder, the combination of a frame having guideways, a brush mounted on said guideways, a plate secured to the brush and having engagement with the guideways to retain the brush in place thereon, and means to hold the brush in yielding engagement with the commutator, substantially as set forth.

4. In a brush-holder, the combination of a frame having side pieces connected by an'integral brace, a brush carried thereby, means to hold the brush in yielding engagement with a commutator, and a flexible connection be tween the brush and the integral brace of the frame, for connecting said brush and frame electrically together, forth.

5. In a brush-holder, the combination of a frame having parallel guideways, a brush mounted on said guideways, a plate on said brush having its side portions engaged with the guideways to retain the brush in place thereon, a screw-bolt for holding said plate to the brush, a flexible conducting-strip havingone end held by said screw-bolt and having its opposite end electrically connected to the frame and means to hold the brush in yielding contact with the commutator, substantially as set forth.

6. In a brush-holder,-the combination of a frame having guideways, a brush having a substantially as i set plate the edge portions of which are engaged with the guideways of the frame to hold the brush for sliding movement on the said frame, and means for holding said brush in yielding engagement with the commutator, substantially as set forth.

7. In a brush-holder, the combination of a frame formed with side pieces having guide- Ways projecting toward each other, a brush movable along the guideways, a plate carried by the brush with its central portion flush against said brush and its edge portions bent away from the surface-of the brush in position to engage the guideways to hold the brush in place thereon, and means to hold the brush in yielding engagement with the commutator, substantially as set forth.

8. In a brush-holder, the combination of a frame having parallel flat projecting guideways, a brush mounted on the guideways, means carried by the brush and engaging said guideways to hold the brush in place thereon, and means to hold the brush in yielding engagement with the commutator, substantially as set forth.

GUSTAVE HENRY JANTZ. WILLIAM LEIST. OTTO WILLIAM JANTZ. Witnesses as to signature of G. H. J antz:

O. H. FETT, RoBT. F. WIRTHOUSE. Witnesses as to signatures of William Leist and O. W. Jantz:

JOHN ELIAS JONES, ARTHUR B. DU BRAY. 

